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US6043463A - Electric heater - Google Patents

Electric heater Download PDF

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Publication number
US6043463A
US6043463A US09/038,224 US3822498A US6043463A US 6043463 A US6043463 A US 6043463A US 3822498 A US3822498 A US 3822498A US 6043463 A US6043463 A US 6043463A
Authority
US
United States
Prior art keywords
heater according
insulation material
mica
heater
covering sheet
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
US09/038,224
Other languages
English (en)
Inventor
David Aubrey Plumptre
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
CERAMSPEED Ltd
Ceramaspeed Ltd
Original Assignee
Ceramaspeed Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ceramaspeed Ltd filed Critical Ceramaspeed Ltd
Assigned to CERAMSPEED LIMITED reassignment CERAMSPEED LIMITED ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: PLUMPTRE, DAVID AUBREY
Application granted granted Critical
Publication of US6043463A publication Critical patent/US6043463A/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/68—Heating arrangements specially adapted for cooking plates or analogous hot-plates
    • H05B3/74—Non-metallic plates, e.g. vitroceramic, ceramic or glassceramic hobs, also including power or control circuits
    • H05B3/748—Resistive heating elements, i.e. heating elements exposed to the air, e.g. coil wire heater

Definitions

  • This invention relates to radiant electric heaters which are provided with a covering sheet.
  • Such heaters may include one or more heating elements which is or are supported on or adjacent to a base of thermal and/or electrical insulation material.
  • Such heaters are well known, particularly in cooking appliances, in which one or more heating elements such as of coiled wire form, or of ribbon form, or of lamp form, is or are supported on or adjacent to a base of insulation material which may be provided in a support dish such as of metal. It is particularly well known and advantageous to use, as a base, compacted particulate microporous thermal insulation material.
  • Heaters of this kind have generally been used beneath a sheet of glass-ceramic material in a smooth top cooking appliance or behind such a sheet in oven or grill applications.
  • a radiant heater incorporating a glass-ceramic sheet is known from GB-A-2 170 590.
  • damage to the heating element may also occur by exposure to some liquids, vapours or particulate materials.
  • the present invention provides a radiant electric heater provided with at least one covering sheet, wherein the covering sheet comprises mica which is at least partially transparent.
  • the at least partially transparent mica may comprise natural mica.
  • the heater may include at least one electrical heating element of wire, ribbon or lamp form.
  • a base of insulation material may be provided, such as of microporous thermal insulation material, having supported relative thereto (that is, on or adjacent to the base) the at least one electrical heating element.
  • the microporous thermal insulation material may be compacted into a dish-like support, such as of metal.
  • the at least one covering sheet of at least partially transparent mica is suitably provided spaced from the at least one electrical heating element.
  • a peripheral wall of thermal insulation material may be provided for the heater.
  • the at least one covering sheet of at least partially transparent mica may be arranged in contact with an outer surface of the peripheral wall.
  • An apertured member may be provided in contact with the at least one covering sheet of at least partially transparent mica.
  • the apertured member may serve as a support for the at least one covering sheet and/or as an electrical screen for the heater.
  • Such apertured member may comprise a perforated sheet of metal, ceramic or other suitable refractory material.
  • the heater of the invention is particularly applicable to cooking appliances such as grills, ovens, especially microwave ovens, deep fat fryers.
  • the at least partially transparent mica applied in sheet form is economically advantageous compared to high temperature withstanding glass or glass-ceramic sheet form materials.
  • Such transparent mica can be applied as a thin sheet, for example of the order of 50 microns in thickness, and exhibits low thermal mass. It also possesses good transmission of visible and infra-red radiation and because of its excellent electrical insulation properties, closer proximity between the heating elements in the heater and adjacent metal components of an appliance in which the heater is used can be tolerated compared with the prior art.
  • the at least one sheet of at least partially transparent mica serves as a barrier to vapours and particulate materials, such as arising from cooking operations, and prevents such vapours and particulate materials from contacting the one or more heating elements in the heater and also insulation provided in the heater.
  • FIG. 1 is a bottom plan view of a radiant electric heater according to the invention.
  • FIG. 2 is a cross-sectional view, in partly exploded form, of the heater of FIG. 1.
  • a radiant electric heater 1 for a cooking appliance comprises a metal dish-like support 2 provided with a base layer 3 of compacted microporous thermal insulation material.
  • a heating element 4 is provided secured to the base layer 3.
  • the heating element 4 comprises a corrugated metal ribbon mounted edgewise on the base layer 3 and secured by partial embedding in the base layer 3.
  • the heating element 4 could instead be of coiled wire or coiled ribbon form or of lamp form or of any other form known to the skilled person. More than one form of heating element could also be provided in the heater.
  • a terminal block 5 for the heating element is mounted on the heater and allows the heater to be connected to a voltage supply for operation.
  • a peripheral wall 6 of thermal insulation material is provided in the heater. As shown, this wall is integral with the base layer 3. However it could be provided as a separate member, as is well known in the art.
  • At least one sheet 7 of at least partially transparent natural mica is provided.
  • Such sheet 7 contacts the outer surface 8 of the peripheral wall and covers the heater and is suitably secured by bent over tags 9, such as of metal and which may be integral with the metal support 2.
  • the sheet or sheets 7 should be as thin as is practically possible and may typically be about 50 microns thickness overall.
  • Such at least partially transparent natural mica is sometimes referred to as clear natural mica and allows adequate transmission therethrough of visible and infra-red radiation from the heating element 4.
  • a perforated sheet 10 is optionally provided overlying the one or more sheets 7 of substantially transparent mica.
  • Such perforated sheet 10 may serve a twofold purpose. It provides support for the mica sheet or sheets 7, enabling the thickness of the sheet or sheets 7 to be minimised and can comprise a metal or a ceramic, or other suitable refractory material.
  • the perforated sheet 10, formed of metal also or alternatively fulfils this screening function.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Resistance Heating (AREA)
  • Electric Stoves And Ranges (AREA)
  • Surface Heating Bodies (AREA)
US09/038,224 1997-04-25 1998-03-11 Electric heater Expired - Fee Related US6043463A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9708338 1997-04-25
GB9708338A GB2324694B (en) 1997-04-25 1997-04-25 Electric heater

Publications (1)

Publication Number Publication Date
US6043463A true US6043463A (en) 2000-03-28

Family

ID=10811308

Family Applications (1)

Application Number Title Priority Date Filing Date
US09/038,224 Expired - Fee Related US6043463A (en) 1997-04-25 1998-03-11 Electric heater

Country Status (4)

Country Link
US (1) US6043463A (de)
EP (1) EP0874535A3 (de)
JP (1) JPH10302945A (de)
GB (1) GB2324694B (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6448539B2 (en) * 2000-02-01 2002-09-10 E.G.O. Elektro-Geraetebau Gmbh Electric heating element and method for its production
CN100434807C (zh) * 2006-08-01 2008-11-19 何拱标 防水电炉

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3408137B2 (ja) * 1998-02-27 2003-05-19 三洋電機株式会社 加熱調理装置
GB2338633B (en) * 1998-06-08 2003-07-16 Dualit Ltd Electric cooking and toasting apparatus and electric apparatus and electric elements therefor
DE10065213A1 (de) * 2000-12-28 2002-07-18 Bsh Bosch Siemens Hausgeraete Gargerät
DE10065215A1 (de) * 2000-12-28 2002-07-04 Bsh Bosch Siemens Hausgeraete Gargerät
GB2407747A (en) * 2003-10-31 2005-05-04 Ceramaspeed Ltd Wall for an electric heater and process for the production thereof

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2752477A (en) * 1954-03-26 1956-06-26 Tappan Stove Co Broiler unit for electric cooking ranges
US4388520A (en) * 1980-08-13 1983-06-14 Micropore International Ltd. Electric cookers with warning lights
GB2170590A (en) * 1985-01-31 1986-08-06 Thorn Emi Appliances Cooking apparatus
GB2180637A (en) * 1985-09-18 1987-04-01 Thorn Emi Appliances A grilling arrangement
US4833288A (en) * 1987-01-13 1989-05-23 Cableco Induction-heated electric hob having support with indicia
JPH02186587A (ja) * 1989-01-11 1990-07-20 Matsushita Electric Ind Co Ltd 加熱装置
US5374807A (en) * 1990-10-15 1994-12-20 Yahav; Shimon Domestic cooking apparatus
FR2727300A1 (fr) * 1994-11-29 1996-05-31 Roth Bernard Appareil de cuisson electrique

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2752477A (en) * 1954-03-26 1956-06-26 Tappan Stove Co Broiler unit for electric cooking ranges
US4388520A (en) * 1980-08-13 1983-06-14 Micropore International Ltd. Electric cookers with warning lights
GB2170590A (en) * 1985-01-31 1986-08-06 Thorn Emi Appliances Cooking apparatus
GB2180637A (en) * 1985-09-18 1987-04-01 Thorn Emi Appliances A grilling arrangement
US4833288A (en) * 1987-01-13 1989-05-23 Cableco Induction-heated electric hob having support with indicia
JPH02186587A (ja) * 1989-01-11 1990-07-20 Matsushita Electric Ind Co Ltd 加熱装置
US5374807A (en) * 1990-10-15 1994-12-20 Yahav; Shimon Domestic cooking apparatus
FR2727300A1 (fr) * 1994-11-29 1996-05-31 Roth Bernard Appareil de cuisson electrique

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
European Search Report EP98 30 2473. *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6448539B2 (en) * 2000-02-01 2002-09-10 E.G.O. Elektro-Geraetebau Gmbh Electric heating element and method for its production
CN100434807C (zh) * 2006-08-01 2008-11-19 何拱标 防水电炉

Also Published As

Publication number Publication date
GB9708338D0 (en) 1997-06-18
EP0874535A2 (de) 1998-10-28
JPH10302945A (ja) 1998-11-13
GB2324694A (en) 1998-10-28
GB2324694B (en) 2001-03-14
EP0874535A3 (de) 1999-06-09

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Legal Events

Date Code Title Description
AS Assignment

Owner name: CERAMSPEED LIMITED, UNITED KINGDOM

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:PLUMPTRE, DAVID AUBREY;REEL/FRAME:009047/0358

Effective date: 19980305

CC Certificate of correction
REMI Maintenance fee reminder mailed
LAPS Lapse for failure to pay maintenance fees
FP Lapsed due to failure to pay maintenance fee

Effective date: 20040328

STCH Information on status: patent discontinuation

Free format text: PATENT EXPIRED DUE TO NONPAYMENT OF MAINTENANCE FEES UNDER 37 CFR 1.362